My silkies and cochins are about 7 weeks old now. They have been outside for about a week. It was nice at first and all has been totally well. Last night got down in the low 50's and they were alive this morning, WHEW! They have an enclosed coop that opens to a run, but I put a tarp over their run as it rained last night. Well tonight it is going in the low 40's. I put the tarp over the run again to keep out any breezes, but I caved and put their red bulb out there tonight. It is a 50 watt bulb, I think. Should I have just let them brave it?